Billy Crystal: Performs finale song for Jay Leno

Billy Crystal: Performs finale song for Jay Leno

Billy Crystal has appeared on Jay Leno's "Tonight Show" on Thursday to perform the finale song.

Crystal, who served as Leno's first guest 17 years ago, delivered a rousing tribute to the outgoing comedian on Thursday.

Billy Crystal's screaming melody includes lyrics taunting Leno's broard collection of cars, his iconic chin and his hair, which has a little black thing and it's all white.

In 2004, Jay leno signed a contract with NBC to host "Tonight Show" until May, 2009. Later in 2004, Conan O'Brien signed a contract with NBC under which O'Brien would become the host of The Tonight Show in 2009, replacing Leno at that time.

Conan O'Brien will handle the reigns on Monday.